relation_byte_size()

Hackers

Here is the definition of relation_byte_size() in optimizer/path/costsize.c:

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/** relation_byte_size*        Estimate the storage space in bytes for a given number of tuples*        of a given
width(size in bytes).*/
 
static double
relation_byte_size(double tuples, int width)
{       return tuples * (MAXALIGN(width) + MAXALIGN(sizeof(HeapTupleData)));
}

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Shouldn't this be HeapTupleHeaderData and not HeapTupleData ? 

(Of course, from a costing perspective these shouldn't be very different but ...)

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Sailesh
http://www.cs.berkeley.edu/~sailesh